长沙市城乡交错带4种人工林土壤养分及其相关性研究

以长沙市城乡交错带4种人工林为研究对象,对各林分林下土壤理化性质进行比较分析,揭示了土壤养分间的相互关系,结果表明:土壤物理性质指标垂直分布规律明显,同一林分内土壤容重基本上随土层深度增加而增大,毛管孔隙度、总孔隙度和自然含水率相反;土壤容重与毛管孔隙度、总孔隙度呈极显著的负相关(P<0.01),与自然含水率呈显著的负相关(P<0.05);毛管孔隙度与总孔隙度呈极显著的正相关(r=0.943,P<0.01);自然含水率与总孔隙度呈显著正相关(P<0.05),与毛管孔隙度呈极显著正相关(r=0.815,P<0.01);各林分内不同土层土壤各化学性质指标垂直分布规律明显,基本上随土层深度增加而减小;土壤pH值与土壤养分因子的相关系数值均为负数,与速效氮含量显著负相关(r=-0.661,P<0.05),土壤有机质与全氮、全磷、全钾、速效钾含量相关性显著(P<0.05),与速效氮呈极显著正相关(r=0.760,P<0.01);土壤全量养分与有效养分间均呈显著的正相关。

Study on the Soil Nutrient and Correlation of Four Types of Planted Forests in Changsha Urban-rural Connective Areas

Taking four planted forests of urban-rural connective areas in Changsha as the research object,soil physical and chemical properties of different forests were analyzed and coefficient between them was studied.The results showed that the regulation of soil physical properties was significant in vertical distribution.Soil bulk density increased with increasing soil in the same forest and the capillary porosity,total porosity and water content were opposite.Soil bulk density had a highly significant negative correlation with capillary porosity and total porosity(P<0.01),and had significant negative correlation with water content(P<0.05).Capillary porosity was highly significant correlation to total porosity(r=0.943,P<0.01).Water content had a significant correlation with total porosity(P<0.05),and a highly significant correlation with capillary porosity(r=0.815,P<0.01).The regulation of soil chemical properties was significant in vertical distribution,which was decreased with increasing soil.The correlation coefficient between pH and soil nutrient was negative.PH was significant negative correlation with A.N(r=-0.661,P<0.05).Soil organic matter had significant correlation with TN,TP,TK and A.K(P<0.05) and had highly significant correlation with A.N(r= 0.760,P<0.01).Soil total nutrient was significant correlation to soil available nutrient.